Improvement in screw-cutting machines



Urvrran STATES PATENT OFFICE.

JOHN W. ROl-V, OF LEVISBURG, PENNSYLW'ANIA IMPROVEMENT IN SCREW-CUTTlNG MACHINES.

S ecification forming part of Letters Patent No. 136,269, dated February 25, 1873.

To all whom it may concern Be it known that 1, JOHN How, of Lewisburg, Union county, in the State of Pennsylvania, have invented certain Improvements in a Combined Screw-Cutting and Drilling Machine, of which the following is a specification:

The first part of my invention, in combination with a drilling-machine, relates to the arrangement and operation of the rack and sliding frame for the purpose of holding various kinds of dies, to receive matters for bein g drilled, or for having a screw-thread cut in them or on them. The second part relates to the combination, with the sliding frame, of a self-feeding arrangement, and manner of actuating the parts.

Figure l is a front elevation. Fig. 2 is a side elevation. Fig.3 shows the lever and screw-clutch arrangement with the sliding frame and die-holder and adjusting-screws. Fig. 4 illustrates the cam on the end of the drill or cutting-shaft with its spring connection, which actuates the pawl and ratchet for turning the feed-screw; Fig. 5, clamp for holding a bolt when cutting a thread on it.

The combination, as a whole, may be briefly described to enable any one skilled in the art to make and use the same.

A shows the side frames of the machine, having guides F on the inner side at one end for the sliding die-holder E e, braced by circular legs D, in combination with a rack, O. Q shows a foot or turning wheel, with a pinion, b, on its shaft B, which is provided with a clutch for putting it in or out of gear with the rack and sliding frame or die-holder. The drill-spindle J with its gear and appliances L K I H i h present no special novelties, and are readily understood. The end of the drillspindle is .provided with an eccentric cam, B,

Fig. 4, between two side pieces, and which are pivoted to the shaft, which contain between them a spring, S, and rod U. This rod U is operated by the cam, and connects with the united side pieces, which have a pawl pivoted between them, of a ratchet-wheel, T, connected to the feed screw Z in hangers r 8 under the frame A, on one side, and parallel with said frame.

This feedscrew Z is revolved by the action of the cam it, depressing the head of the rod U, and causing the pawl to act upon the ratchet. The rodU is successively drawn back by the sprin g S at each revolution of the cam.-a well-known device, but not known of ever having been arranged in combination with a drill-spindle in the manner shown for drilling purposes.

The drill-bed or sliding frame E E has a clamp-nut attachment, f t g,'affixed fby pivotjoints below, through which nut the feed-screw Z passes, and is firmly embraced or released at pleasure by the cam-headed lever to, which compresses or relaxes the hinged clamps combined with it, as shown by Fig. 3.

Thus, by turning the hand-wheel N motion is given to the drill-spindle by the ordinary gearing L K, which imparts motion through the cam-connection to the feed-screw and sliding frame, as shown and specified.

The bed to receive the dies Y Y, slipped in from one side, and adjusted by the side screws X with milled heads, is not claimed as new.

The "drill-spindle is adapted to hold screw taps, as also a special clamp or holder, Fig. 4, is adapted to hold'the bolts when cutting the thread on them; and, in short, the rack-motion of the sliding frame and the facility which the clan-1 p-lever gives in the action of the feed-screw render this machine peculiarly valuable for cutting, drilling, holding nuts, bolts, taps, and dies of various forms, and imparting to them the necessary speed and power, (rotary or direct motion,) so as to meet numerous demands in a machine-shop, and the want of which is often experienced.

I am aware that screwnnachines for bolts, nuts, 850., as well as drilling-machin es, are used; and that dies and die-holders are variously employed, as also feed-screws; but I am not aware that there is a drilling-machine in which the bed is so formed as to hold dies for cutting screws on bolts and in nuts; as also the self -feeding device in connection with the. stocks and independent hand and foot feed: therefore,

-What I claim as my invention, and desire to secure by Letters Patent, is-

1. The arrangement of the sliding frame or die-holder E e in the guide-ways F, when provided with the clamping-screw bur f, hinged jaws t g, and camheaded lever u, together rod U for operating the pawl V and ratchet with the rack O, by its connecting-arms D, T in combination with the feed-screw Z all operated by the pinion b on the shaft B, with arranged and operated substantially as and its foot-wheel Q, the whole substantially comfor the purpose set forth. bined and operated in the manner and for the J. W. ROW. purpose specified.

2. In combination with the drill-spindle J Witnesses:

' and its'applianoes, the arrangement of the JOSIAH KELLY,

cam R in its bearings with the spring S and R. H. LAIRD. 

